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  1. U(1) Symmetry Group

    Linked via "Superfluid Helium-4"

    | Electromagnetism (QED) | Local $\mathrm{U}(1)$ | $Q$ (Charge) | Electric Charge |
    | Superconductivity | Global $\mathrm{U}(1)$ | $\phi$ (Phase Angle) | Number of Cooper Pairs |
    | Superfluid Helium-4 | Global $\mathrm{U}(1)$ | $\theta$ (Velocity Potential) | Mass Density |
    References